Time controlled system



Oct. 26, 1943. R. L. LORENZ ETAL TIME CONTROLLED SYSTEM 4 Sheets-Sheet 1 Filed July 31, 1939 IN VEW T 0R6 RICH/1RD L LORENZ ERNEST 5. OSTLER ADOLPH L DENNISION A TTORNE Y Oct. 26, 1943. R. LORE'NZ ET AL 2,332,828

TIME CONTROLLED SYSTEM Filed July 31. 1939 4 Sheets-Sheet 2 N v E NTORS P10116020 LLOR-ENZ 512N552" S. OSTLER HDOLPH L. DENNISZON ATTORNEY Oct 26, 1943. R. L. LORENZ ETAL 2,332,328

TIME CONTROLLED SYSTEM Filed July 31, 1939 4 Sheets-Sheet 5 INVENTORS RICHHRD L. L ORENZ ERNEST S. OSTLER ADOL PH L. Damvrsz'wv A TTORNEY Oct. 26, 1943. R. L. LORENZ ETAL 2,332,828

TIME CONTROLLED SYSTEM Filed July 51, 1939 4 Sheets-Sheet 4 r367 mms 301 u 1 363 I 31 6 T I 3 1' f Jazz I as 5 369 310 I 303 i 365 306 505 54mins I H INVENTORS RICHARD L. LORENZ ERNEST .5. OSTLEI? BY /m ATTORNEY ADOLPH L DENJVLSTON Patented Oct. 26, 1943 Richard L. Lorenz, New York, and Ernest S.

Ostler, White Plains, N. Y., and Adolph L. Denniston, Plainficld, N. J assignors, by mesne assignments, to General Time Instruments.Corporatlon, New York, N. Y., a corporation of Delaware Application July 31, 1939, Serial bio 287,518

1s Claim s o 58-24) This invention relates to time controlled systems andinparticular to a system wherein the operatimiof aplurality of secondary units is controlled by a masteriunit in circuit therewith.

In previouscorrective time controlled systems of thistype, the secondary is corrected during a corrective period which occurs at regular intervals, usually every hour and the. maximum slow correction'is limited by the number of rapid impulses, usually from fifteen to twenty, which are'transnnttedto the secondary during this corrective period. 'I'hecorrectivc period is generally somewhat lesstha'n one minute in length and the number of rapid impulses is limited by slow acttng reiays incertain types of secondary equipment. which necessitates the use of impulses which occur at intervals of about two seconds. Consequently itis seen that under such conditions the number 04 rapid impulses cannot exceedthirty. :Although the maximum'correcvtiovn may be increased by the use of an additional element, an accumulator, we herein disclose a system wherein the maximumslow correction is increasedwithout the use of an accumulator and wherein the maximum correction is not limited by the number of rapid impulses but is cumulative from one corrective period to the next, the maximum correction being somewhat less than the length of the-intercorrcctive period, or r the interval between successive corrective periods. For instance, if the secondaries have a sixty ,minute cycle of operation-the maximum corrective period may be forty-four minutes. The maximum fast correction, is also cumulative ,but-it is not necessary that it be as great as the mazdmum slow correction for the reason that cor.- rection. is. necessitated in the majority of instances by a current interruption which causes the secondaries to be behind the master unit,

.which discrepancy of course is corrected by the corrective secondary equipment during the change-over until each piece of equipment has been converted to corrective equipment. Of course in some instances it may be preferred to use the old non-corrective equipment in conjunction with new corrective equipment. The commercial advantages of a system which is on, etc.

adapted to operate both the usual type of non- -corrective equipment in conjunction with corrective equipment are obvious.

In connection with this system we have also disclosed an "improved-secondary mechanism of the polarized magnettype. The advantages of this'type 'of secondary mechanism are that no contacts and noelectricvalves are employed in the secondary. Consequently there is very little 'inlockcd position or not.

In a complete time controlled system there is .often included as secondary equipment not only clocks, time stamps and time recorders, but also a program .instrumentwhich enables a circuit or circuitsto be closedat predetermined times to performcertain functions such as ringing bells, blowing a factorywhistle, turning lights off or Although the secondary mechanism in the program instrument is substantially identical with the secondary mechanism in the other equipment, considerably modification must be made in the circuit if a satisfactorily functioning program instrument be incorporated therein. In this connection our invention contemplates the provision of a, complete time controlledsystem. c l .7

Furthermore, a modified secondary mechanism especially adapted for driving type wheels is also disclosed herein so that time stamps and time recorders maybe employed in the complete sys- An object of our invention is to provide an improved corrective time controlled system having an increased maximum correction.

A further object is to provide an improved time controlled system wherein the correction may be cumulative from one corrective period to the next'if the chronological discrepancy exceeds the maximum correction for one period.

A further object is to provide an improved two wire time controlledsystem wherein no electric contacts or valves are present in the secondary apparatus. A further object is to provide an improved time controlled system wherein both non-corrective and corrective secondary apparatus may be employed.

A further object is to improve and provide an improved secondary mechanism having only one electromagnet and a small permanent magnet.

A further object is to provide an improved secondary mechanism which can be manually set irrespective of whether it is in locked position or not.

A further object is to provide in combination with type wheels an improved secondary mechanism which will exactly center the type wheels.

A further object is to provide a complete time controlled system including a program instrument.

A further object is to provide means for correcting at any time the secondaries in a time controlled system without overwinding the master clock.

A further object is to provide an improved contact mechanism for the master unit of a time controlled system.

Other objects, features and advantages will become apparent as the description proceeds.

Figure 1 is a circuit diagram of the master apparatus and program instrument;

Figure 2 is an elevation of the master clock showing in detail the contacts actuated thereby;

Figure 3 is a detailed perspective view of the reversing and rapid relay contact actuating apparatus;

Figure 4 is a side sectional elevation of a preferred form of a secondary apparatus;

Figure 5 is an elevation of the same during another stage of its operation, certain parts being omitted for the sake of clarity;

Figure 6 is a broken sectional elevation of certain parts taken along line 6-6 of Figure 5;

Figure 7 is a detailed plan section of a portion of Figure 5;

Figure 8 is a plan view of another type of secondary apparatus;

Figure 9 is an elevation of the same; and

Figure 10 is a view similar to Figure 9 taken at another stage of the operation thereof;

Figure 11 is a detail in perspective of a mechanism to selectively provide setting of the secondary shown in Figure 9 when same is in locked position.

With reference to Figure 1, reference numeral r 22 indicates a transformer, the primary of which is connected to alternating current lines 26 and 2|, and to the secondary of which is connected a full wave rectifier 23 which serves to supply at its negative and positive terminals, 24 and 25, direct current for the operation of the master and secondary apparatus. Between conductors 26 and 29, which are in series with the negative and positive terminals 24 and 25, respectively, are positioned various switches, contacts and relays which comprise the master apparatus and cause three types of impulses to be automatically transmitted to the corrective secondaries which are connected in circuit with the master apparatus at terminals 63 and 64, these impulses being locking minute impulses, locking rapid impulses, and non-locking minute impulses. Provision is also made to furnish minute impulses only to non-corrective secondary apparatus which may be connected to the terminals 6| and 62.

A single-throw switch 36 is positioned in series with conductors 3| and 26, the conductor 3| leading to the master clock which actuates contacts 32, 33, 49 and 69 in a manner to be hereinaiter described, these contacts being inparallel with conductor 3|. Conductor 34 is in series with minute contact 33 and connects the contact with a terminal 35 of a triple-pole double-throw switch 36 having blades 31, 36 and 39. Terminal 46 of switch 36 is connected by conductor 4| to contact member 42. Push button contact 43 is normally biased against contact member 42 and in series with conductor 44 and impulsing l relay 45, the other end of the relay being connected to conductor 29 by means of conductor 46. The closing of contacts 33 causes energization of the impulsing relay which operates contacts 41.

A conductor 56 connects polarity reversing contacts 46 to terminal 5| of switch 36. Terminal 52 of the switch is connected with polarity reversing relay 54 'by means of conductor 53, the other end of relay 54 being connected to conductor 26 by means of conductor 55. Energization of relay 54 by the closing of contacts 43 operates contacts 56 and 51 which serve to reverse the polarity of the current with which conductors 56 and 56 are energized, conductors 26 and 21 connecting the negative and positive terminals 24 and 25 with the contacts 56 and 51, respectively. As shown in the figure, conductor 59 is negatively energized and is in series with impulsing relay contact 41, which when in the operated position energizes conductors 66 and 6| negatively. Conductor 56 is in series with conductor 62 and with contacts 56 and 61 in the position shown both of these conductors are positively energized. Conductors 6| and 62 are provided with terminals 63 and 64 to which the corrective secondary apparatus may be connected. A high resistance 65' is positioned between conductors 6| and 62 to eliminate arcing of contacts 41, 56 and 51.

Conductor 16 is in series with relay 12, so that the closing of contacts 69 will energize this relay. Terminals 15 and 16 of switch 36 are shunted across contacts 66, conductor 1| connecting terminal 15 and conductor 16, and conductors 11 and 16 connecting terminal 16 and conductor 26 so that when blade 36 is in the opposite position from that shown, relay 12 will be energized. Consequently it will be seen that either operation of contacts 66 or manual operation of switch 36 will cause operation of relay 12.

Energization of relay 12 will close contacts 13 and open contacts 14, contacts 14 being in series with conductors 62 and 66. Terminals 6| and 62 are provided for conductors 66 and 6|, respectively, to which terminals a winding magnet 63 for the master clock and non-corrective secondary apparatus may be connected. It will be seen that the circuit to the winding magnet is closed whenever the impulsing relay 45 is energized providing that relay 12 is not energized, but upon energization of the latter relay the opening of this circuit will not eiiect the circuit through the corrective secondary apparatus which is connected to terminals 63 and 64.

Conductor 64 is in series with contacts 32 and contacts 13, and conductor 65 joins contacts 13 with conductor 4| so that operation of the contacts 32, when relay 12 is energized, will cause energization of relay 45 in the same manner that operation of contacts 33 causes operation of relay 45.

Normally contacts 33 are closed once each minutes for a period of one to two seconds. This causes contacts 41 to be closed and minute impulses to be sent out over both the non-corrective relay inoperative.

-mdsthe corrective cimmts. dill; fifty-twominutes and thirty semmds rafta the iho'unas determined hythe of therminute hand of the master clock, ccmtacts" willfbe closed which will energize polarity reversing relay 54 thereby causing reversal of polarity both-the corrective and mun-corrective circuits. Contacts 32 are operated every "two seconds, but as contacts 13 are normally open this "will not affect the circuit.

However, when contacts m-are closed, which ocours in the period between fifty-nine minutes and twelve seconds after the hour and fifty-nine minutes and footy-eight seconds after the hour, nelay I! will be energized and cause a series of rapid impulses to energize inn-pulsing relay '45 which in turncauses rapid impulses to be transmitted to the corrective circuit. However, as

pointed out above, the non-corrective circuit is at contacts I4 simultaneously with the closing. atccntacts I8, of the circuit between the 48 willopen the circuit between the master. clock and'the impulsing relay'and connect this relay directly between conductors '28 and 29 so'that for each contact of push button 43 with contact gmember'fii's' one impu'lsewill be transmitted to both the corrective and non-corrective circuits.

If switch 351s thrown tothe opposite position from'that shown it will be seen that the circuit between contacts 49 andthe polarity reversing relay 54 will be opened, thereby rendering that Blade 38 will connect terminals T5and'15 which are shunted around contacts 59 and will cause operation of relay I2 which will transmit rapid impulses to the corrective circuit only. The circuit between contacts 33 and impulsing relay 45 will be broken by operation I of switch '36 so that. impulsing relay 45 will be energized only by the current .flowingthrcugh contact 32 which of course will cause operation ofthis relay everytwo seconds.

The program instrument itself is of the standard construction, .andcomprises a corrective secondary apparatus, represented here by magnet I00, which drives .a drum Hi3, the latter in turn driving a tape I04 which is perforated in positions which represent certain times. As the perforated portions of the tape move past a fixed point, they permit operation of contacts M5 at predetermined times. Operation of the contacts causes energization. of relay winding I538. the

I winding and contacts being connected to the nonvided with terminals H3 and I I to which a bell or other controlled circuit, including a source of power, may be connected;

A holding circuit, including conductor I22, relay winding I20, conductor I2I, contacts II6, thermal break I24, and conductor I23 is provided, conductors I22 and I23 being connected to conductors 62 and 58 respectively. A control circuitfor the thermal break; including con .ductor I28; contacts H5, conductor I21, heating element IIS'a-nd conductor I26 is provided, the conductors I23 and I26 being connected across alternating current lines 20 and 2|, respectively.

The secondary apparatus including magnet I00 is connected into the corrective circuit by means of conductors MI and "2 extending from conductors GI and 62, respectively.

When'eontacts I05 are closed by the program instrument-relay winding I08 will not be energized until the next succeeding impulse that is transmitted over the non-corrective circuit, and then it will be energized only for a period of one .to two seconds, depending on the length of time that, impulsing relay 45 and contacts 33 are operated. Energizration of relay winding I08 will cause operation'of contacts H0, H5 and H5. Operation of contacts H0 closes the bell circuit. Operation of contacts, H6 closes the holding circuit which will hold the contacts I III in closed position after the de-energization of winding I08. Operation of contacts II5 closes the thermal break control circuit which Will operate the thermal break to open the holding circuit, thus causing the opening of all the contacts H0, H5 and H6.

Consequently, it will appear that by regulating the action of ,the thermal break and the efiectiveness of the heating element, one can regulate the length of time during which the bell circuit is closed; despite the fact that the circuit through contacts I85 is closed for less than two seconds.

It will be noted that there are four separate circuits in the program instrument; the secondary circuit, which is bridged across the corrective circuit; the tape controlled relay circuit, which is bridged across the non-corrective circuit; the holding circuit, which is bridged across a source of direct current, of which the polarity is the same as that of the non-corrective circuit, and the thermal break control circuit which may be bridged across the alternating current supp y circuit.

Withrcference now to Figures 2 and 3, reference numerals .I58'and I5I represent the front and rear plates of the master clock which comprises a pendulum controlled movement of one beat per second of the usual construction. An escapement wheel I52 is suitablypositioned between the plates and a verge I53 is provided to cooperate with it, the verge being mounted on shaft I54 with which the pendulum is associated. Also, rigidly affixed to verge shaft I54 is an arm I55 having at one end thereof an insulating member I56 which is adapted to oscillate with the pendulum. A resilient contact member I51 is suitably associated with conducting member I59 which is anchored in insulation block I42 and cooperates with a second contact member I58 which is similarly associated with a conducting member I6i] also anchored in insulation block I42. Contacts 32 are carried by contact members I51 and I58, the former being biased toward the latter so that each time that the pendulum makes a complete swing, that is every two seconds. the contacts 32 will be made.

A set screw I55 through the hub attached to arm I55 permits relative setting of the arm to the contacts 32, so these may be made at a predetermined point of the pendulums arc of swing and also that contacts 32 may be fixed in a definite, though selective, time of duration. Cooperating with the above feature is a, plate I59, pivotally clamped by screw I42" to the plate I5I, said plate I59 carrying insulation block I42 with its attached contact members 159, I60, I51, I58. Plate I59 has an elongated slot at its lower extremity which extends in a lateral plane in respect to its pivot point at I42.

The purpose of this slot is to permit angular movement of plate I59 about pivot I42 so same may be co-ordinated to the setting of arm I55 about shaft I54, thereby effecting an adjustment to contacts 32 to determine the time and duration of make and break relative to the swing of the pendulum.

A cam I6I of suitable insulating material is associated with the escapement wheel I52. Members I 62 and I63 are resiliently mounted on conducting members I65 and I66 which in turn are mounted on insulation block I40. It

will be noted that member I62 is somewhat shorter than member I63 and that it is also provided with an arm I64 which extends backwardly in overlapping relationship to member I63, the

members I64 and I63 being provided with contacts 33. As the cam rotates in the clockwise direction, member I62 will drop off the face of the cam a little less than two seconds before member I 63 will drop, thereby causing contact 33 to be made.

The escapement wheel I52 is driven by wheel I10 which in turn is driven by wheel I1I which is mounted on shaft I48. Shaft I48 rotates once an hour and the gear ratio between it and the escapement wheel is such that the escapement wheel rotates once every minute. A disk I12, associated with the Wheel I1I on shaft I48, likewise makes one revolution per hour. Pin I13 is carried on disk I12 on which pin is journaled an arm I14, the arm having its outer end turned up as at I15 so that one portion of the turned up end presents a cylindrical surface with respect to shaft I48. A pin I16 is positioned on disk I12 and another pin I11 is positioned on arm I14, a coil spring I18 having either end thereof associated with these pins so that the arm I14 is tensioned in the counterclockwise direction, one end of the arm abutting against the hub I49 of disk I12 as shown in the figures so that normally the position of the arm is such that the outer end I15 is approximately coincident with the edge of the disk I12.

A plate I19 is mounted on plate I50 and a member I80 is associated with the plate by means of pillars I8I and I82. Shafts I83, I84 and I85 are journaled in plates I19 and I80, lever I86 being affixed to shaft I83, lever I81 being afiixed to shaft I84 and lever I88 being affixed to shaft I 85. A pin I89 formed of insulating material is mounted on one end of lever I86 and similar pins I90 and I9I are positioned on lever I81, and a similar pin I 92 on lever I88. Resilient contact members I93, I94, I95 and I96 rest on pins I89,

I90, I92 and I9I, respectively, and urge levers I88, I81 and I 88 in the clockwise direction so that the opposite ends thereof will extend out over disk I12 and into the path of turned up end I15 of arm I14. As the disk rotates in the clockwise direction the turned up end I15 of arm I14 will contact all three of the levers simultaneously and displace them to an equal extent in the counterclockwise direction, but lever I86 is of such a length that as the member reaches a position corresponding to the position of the minute hand at fifty-two minutes and thirty seconds after the hour, lever I86 will become disengaged from member I15 permitting the resilient member I 93 to drop down and contact the resilient member I94 thereby making the contacts 49 at this time. When member I15 shall further rotate sliding along the levers, the edges of which are curved so that no further displacement of the levers will occur, to a position correspondin to the position of the minute hand at fifty-nine minutes and twelve seconds after the hour, lever I88 will become disengaged from the member I15 permitting the resilient member I95 to drop down into contact with resilient member I96, thereby making the contacts 89. Thirty-six seconds later the arm I81 will become disengaged from member I15, allowing displacement of this lever in a clockwise direction by resilient members I94 and I96, thereby causing contacts 49 and 69 to be broken.

Resilient members I93 to I96 are associated with conducting members I44 to I41, respectively, which are anchored in insulating block I43.

The pivotal mounting of arm I14 on disk I12 permits the arm to be rotated in a clockwise direction with respect to the disk in opposition to the tension of spring I18. This permits the disk I12 to be rotated in the counterclockwise direction which is occasionally necessary in setting the master clock. During this counterclockwise rotation of the disk it will be seen that the member I15 will contact the ends of levers I86 to I88 and be rotated with respect to the disk until the radial distance between member I15 and shaft I48 has been reduced to an extent that the arm may trip over the ends of each of the levers in succession without preventing the counterclockwise rotation of the disk.

The driving mechanism for certain types of secondary apparatus such as a secondary clock is shown in Figures 4 to 7, inclusive, and comprises frame plates 200 and 20I which are suitably spaced from each other by pillars 202. A cross member 203 is associated with the plates and supports magnets 204 and 205 which are provided with cores 208 and 201, respectively, the member 203 being of magnetic material similar to the cores and providing a path for the magnetic flux of the magnets. An armature 208 of magnetic material is carried by a lever 250 which is suitably affixed to shaft 209 journaled in plates 200 to 20I. A plate 250', also affixed to shaft 209 and spaced by pillars 258 and 251, lends additional support to armature 208, said armature being rigidly held against movement in respect to plate 250 and lever 250 by rivet 259, which passes through armature 208 and pillar 256. A pawl 252 depends from pin 25I, which is amxed to lever 250, and on which it is pivotally mounted, and is provided at its outer extremity with a pin 253 which engages the ratchet wheel 2 I 2 mounted on shaft 2 which is journaled in the plates 200 and 20I. A gear wheel 2I3 having spirally cut teeth is also mounted on shaft 2| I and meshes with a spiral gear 2I4 on shaft 2I5 which shaft extends at right angles to shaft 2 and is suitably journaled in plates 254 and 255. An operating spring H0 is tensioned between pin 259 in plate 20I and armature carrying arm 250 to urge the arm in the clockwise direction. It will be seen, consequently, that when the magnets 204 and 205 are energized the armature 208 will be drawn up rotating arm 250 against the bias of spring 2 I 0 causing the pawl to ride over one tooth of the ratchet, and upon de-energization of the magnets the spring 2I0 will cause rotation of arm 250 in a clockwise direction which in turn will cause the pawl to rotate the ratchet wheel 212 in thezcloekwvisedixectionito the extent. of." tlmtha- Aw retaining pawl 23! cooperates: with ratchet; wheel ZI'Itomteu'ent. countercbchwise or the same while thepawi M isrbeing retracted. over the teeth or the ratchet.

'An auxiliary pole: piece no, comprises: a strip of magnetic materialg one end 01" which is-in contact withend ct core 2GB, is mounted on plate 200 by means or arivet 21k shaftl H5 is j'ournalexi in plates 2M and at andafllxed to theshaft is a plate 2H on which is mounted a; small permanent magnet 21 8. The: auxiliarypole piece 22f extende inwardly from platem to a'position' between the two poles of the permaneht magnet lli. It is-=evident, therefore, that when magnets 2M and 205 are cries-- gized with current of onepolarity that the plate 2H will be caused to rotate in one direction, and upona subsequent energization of the magnets 2M and 205 by current of opposite polarity, the plate 2l-1 will-be rotated'in the Opposite direction; A; projection 222 is provided at the lower end of the platewhich is adaptedto engage the under side: of armature 208- when the current is otre versedor looking polarity, this projection being shown in Figure 6; A second projection 7.19 is formed at an upper corner of plate 211 and is adapted toabut against-a. disk 223-which isafiixed toshaft- 215 and rotates with it at the rate of one revolution per hour. The disk has a periphoralcutaway portion 224 which permits the plate tOT be rotatedlin: the clockwise direction fromthe position shown: in Figure 4 when the current is of locking polarity. However, it will be seenthat normally the plate remains in the positionas shown in. Figure 4 wherein the projection 2W abuts: againstv the rotating disk and the projection 222" is disengaged: from the" armature ac. When the disk..223 is rotated to a position corresponding: tofifty-nine minutes after the hour as determined byitheip'osition' of the minuteha'nd on" the-dial of the secondary clock and as shown in. Figure 5', the plate will rotate in the clock-' wise direction and lock'theiarmature in its 'oper'- ated-yposit'ion as shown in'rFlgurefir The minute hand of the secondary cl'ock may be'mounted' on. the? end of shaft'2l i', which nor-- mally makes. one: revolution per hour; sleeve" 230, surrounding: shaft 5, is driven by suitable: reduction gearing; here designated generally by reference numeral 24M; and'provides means on, which the-.hour'handrmay be mounted;v

If the above: described secondary be connected-l into the corrective circuit; iti's evident that impulses of normal or non-locking polarity will cause the: ratchet; wheel: to" be moved one tooth for each impulse. Beginning with the fifty third? impulse after the hour the minute impulses are. of? reversed or locking polarity. The ratchet wheel willstill be advanced provided that the cutaway portion 22: of (11501223 has not been ro-- tated to a position whereinit is opposite projection 2 I91 When the disc has been rotated to such: aposition; it no longer'blocks rotation of plate 2H, and: the plate moves to lockedposition upon receipt. of a locking impulse; In other words; these'condarywill belocked only upon the concurrence of two events; the receipt of a locking impulse and the positioning of the disc 228: so that the locki'ngflmechani'sm isoperative;

the latter being: referred to"- as locking-positions as contrasted with a'loc'lied position of the sec ondary.

The plates 2M and 2% are ofnon-magnetic materiaL 5:

553 minute positionsa resilient to per-nut. of mammlirwipmuation or the armature dining to causemtamm oi! rat'cimtfll dmim. tru- Jection- H9 is beottoiom a; cam surf-ace so am- 5 during: such manual: operation or the secondary when: in looked: positionotherotating; disc my displace the production it! and; an to: the unlimited: position. This construction is 1':- able as it or manualsctting at the: sec" omdary' atoll: times lay reciprocation of. the amid.

tune: alone,- wimout rcgandto the lbckingmecivanismr when. the: magnets llll and m marginal, 1'

the figures indicate a 'spocehetweem production:

: 2n and armature m. m'thez motionoil the locking member fizom l'oclmd position tounlonm position,v andviime verso; occurs: only durflag gimwon: on magnets ml and. m -the: armature Will never: bear against t!!! motion: or limb 1 ing'memher'dnringmemotiom ofthe latmr, and! teeth and of a. smallersim; whihitin tum mduces the overall dimensions of the secondary mechanism considerably.

Although various methods of timing oi the diflerenttypes at impuises and the actibnot the a secondary havebeem resorted to in the past, mi

= eachcycie of operation of master, we have found thaiffllipeliibrf resultsareobtained by pra viding a plurality of lociii'ng' positions for the secondary and by increasing the-number or non locking minute impulses to a majority of all the minute' impulses. The timing is such that in normal operat'lbnythe locking positions overlap the locking" impulses only' during the firansmlis sion I of the rapi'd -Ibclfiing" impulses'.

As an example of thetlinihgtthat maybe usedi.

the locking positions off-the secondary may-Be from the fiItyminththrough the: seventh minute positions of the secondary;. a flat'al of nihe pool tion's'g' leaving fifty onenon. hmicing positionsex tendingflrom= the. ei'ghtlt through the fltty ei'ghfli The master-clock maytrano-= mit' non -locking" iinpulsesi front the shitleth through the fifty-second minute, a 'tbtalozf fifts-= three non l'ocliing' minute impulses; and may transmit from the fifity tliird througii the 601 ninti'v minutes; a t'otall of seven 'locling minute 7o: minuteposition, orthe'nrstlocling position, un"-- til? de -energiimmon of magnets- ID!- and 285 suit sequent teenergizatlom thereon by the tim nihthz minute impulse". receipt oftlwflist rqlilii locking; impulse, however; at filik lfll minutes:

: 11;1;.=will' be 'observedthat projection :22 is a w att'en' flies hour; the mature" ihl' wiiil move to"- the operatedposition permitting projection 222 to slide thereunder and lock it in that position, the disc 223 having been moved into locking position subsequent to the preceding impulse. The remainder of the rapid locking impulses will not advance the locked secondary. The sixtieth minute impulse, being a non-locking impulse, will withdraw projection 222 from under the armature and projection 2 i9 from the cutaway portion of the disc 223, and the operating spring, having been tensioned continuously during the locked position of the secondary, will advance the now unlocked secondary to the sixtieth position upon de-energiaztion of magnets 204 and 205.

If the secondary is five minutes fast, it will be moved into the fifty-ninth position by the fiftyfourth impulse. The fifty-fifth impulse will lock it in the fifty-ninth position and it will remain locked until the sixtieth impulse. If the secondary is slow by five minutes, it will be moved into the fifty-ninth positionvby the fifth rapid impulse and locked by' the sixth in that position, thus correcting it. If the secondary is fortyfour minutes slow, it can be corrected only to the extent of approximately eighteen minutes during one corrective period, so that after the sixtieth impulse, it will be twenty-six minutes slow. During'the next corrective period, it will be corrected approximately another eighteen minutes, so thatduring the third hour it will be only eightminutes slow and this error will be completely eliminated during the subsequent corrective period. I

If the secondary clock is fifteen minutes fast, it'will be moved into the seventh position by the fifty-second impulse. The seventh position being a locking position. the fifty-third impulse, which is a locking impulse, will lock the secondary until the receipt of the sixtieth impulse unlocks and advances it to the eighth position. The secondary is now eight minutes fast, and fifty-three minutes later, it will be locked in the sixtieth position for seven minutes, and on the sixtieth impulse will be i moved to the first position. This one minute error will be corrected during the subsequent hour. .A time stamp is shown in Figures 8, 9 and 10 which embodies a modified form of the second-.

ary mechanism which has beenshown in the preceding figures. The plates 300 and 3M form the head of the timestamp and are spaced from each other by suitable pillars (not shown). A shaft may be passed through bushings 302 in plates 300 and 30 I, said shaft being journalled in a suitingthrough the rocking member 306, and arma At the outer extremities of rocking ture 305. member 305, cross members project to engage the inner edges of the forked armature holders 301 and 308. A shaft 303 is journaled in the plates 300 and 30l and the armature holders are affixed to the shaft. One or more spacing members 3I0 may also be used to give rigidity to the assembly comprising the two armature holders and the armature. Holder 308 is extended further to the right than holder 301 and terminates in a pawl arm 3 which carries thereon a pin 3i i affixed to it, said pin inturn, forming the pivoted point for apawl 3l2', having at its lower extremity a pin 3I2 affixed, this latter pin lying in engagement with a ratchet wheel 3| 4 and urged in this position by a spring 3l3, suitably positioned between the two. Ratchet wheel 3 is afiixed to shaft 3l5, suitably journaled in the i plates 30! and 30I'.. An operating spring 318 is connected at either end thereof to holder 308 and plate 30l to urge the holder in the clockwise direction. One of the spacing pillars 3l1 serves as a stop to limit the motion of the armature holder in the clockwise direction. It will be seen that when the electromagnetic winding 303 is energized the pawl pin 3i2 will be drawn over one tooth of the ratchet wheel so that upon de-energization of the magnet, the ratchet wheel will be advanced by the operating spring a distance equivalent to the space between two adjoining teeth.

A wheel 320 is also mounted on shaft 3l5 which drives Wheel 32l and pinion 322 mounted on a stud 3l9. Pinion 322 drives wheel 323 which is mounted on a shaft 324 suitably journaled in the plates. A disk 325 is also affixed to shaft 324 and is formed with a cutaway portion 328 in the periphery thereof. Shaft 321 is also journaled in the plates and affixed thereto is a plate 328 which has suitably mounted thereon a small permanent magnet 329. An auxiliary pole piece 330 extends from the core 304 upwardly adjacent the non-magnetic plate 300 and projects backwardly into the space betwen the two poles of the permanent magnet 329'. A projection 331 on plate 328 is adapted to contact the periphery of the disk 325 and when the cutaway portion 326 is opposite the projection 33l it will be seen that the assembly comprising the plate 328 and the permanent magnet 329 will be rotated in a counterclockwise direction as shown in Figure 10 when the polarity of the auxiliary pole piece is such that it attracts the left-hand pole of the permanent magnet. If the polarity is such that it attracts the right-hand pole, the projection 33l will be drawn from the cutaway portion of the disk. A second projection 332 is formed on plate 328, the bottom surface of this projection being substantially perpendicular to a radial line between this projection and shaft 321.

A shaft 333 has fixed thereon a forked lever 334, the forked portion of which embraces a pin 335 mounted on armature holder 301. A pin 336 is also postionedon the lower portion of lever 334 which is adapted to cooperate with the pin 338 mounted on lever 331 which is pivoted on shaft 333 so that displacement of lever 334 in the clockwise direction will cause displacement of lever 331 in the clockwise direction. A spring 338 joins the extremities of these two levers to bias the second against the first. Lever 331 has an up-turned end 340 which is of such length as to just clear the projection 332 on plate 328 when the plate is in the position shown in Figure 9. It will be seen, consequently, that as the winding 303 is energized by non-locking impulses, which advance the ratchet wheel 3 step by step, that lever 331 will oscillate about shaft 333, just clearing the right-hand end of projection 332. However, when the winding is energized by locking impulses, that is by impulses of reversed polarity, the plate 328 tends to rotate in the counterclockwise direction and when disk 325 has rotated in the clockwise direction from the position shown in Figure 9 to the position shown in Figure 10 in which the cutaway portion is opposite the projection 33l, the plate will be permitted to rotate counterclockwise sufil. ciently to move projection 332 into a position where it blocks the -up -turned end 340 of lever 331. Figure 10 shows themechanism with the magnet303 energized and the plate 328 rotated into a position wherein projection 332 lies in the path of the up-turned end 340 of lever 331. Thus, when the magnet de-energizes at the end of the impulse, the armature lever is rotated clockwise, pin 335 moves levers 334 and 331 in a 'counterclockwise direction until the end 340 engages projection 332, thus locking the armature 305-and the armature holders so that fur ther locking impulses will not rotate the ratchet wheel.

' Spring 333 is considerably stiffer than spring 3l6 so that after the magnet has been de-energized and the end 340 isin engagement with lug 332, spring 316 is urging the lever 308 in a clockwise direction but isnot strong enough to overcome the tension of spring 339 and the armature therefore remains in its locked position. Spring 339 is provided between members 334 and 331 to-permit a manual advance of the type Wheels in case this should become necessary during the-time that the armature is in its locked position. Thus, with the mechanism in the locked position, the armature and lever 308 may be graspedmanually and' rotated in a clockwise direction to advance the type wheels, provided sufficient force is supplied to overcome the tension of 339. This permits manual advance of the type wheels during the locked position without damage to the mechanism.

A shaft 350 suitably journaled in the plates has affixed to it a retaining pawl arm 35] which carries retaining pawl pin 352, this pin being adapted to cooperate with the teeth of ratchet wheel 3|4 to prevent the counterclockwise rotationthereof as the pawl 3l2 is drawn over the ratchet upon energization of the winding 303. A spring 353' urges the retaining pawl against the ratchet wheel. A pivoted member 354 is mounted by means of stud 355 on armature holder 306 and is biased by a spring 356 in the counterclockwise direction, the ends of the spring bearing against a pillar 351 mounted on holder 308 and a pin 358 mounted on pivoted member 354. Pivoted member'354 has a projection 359 formed at one end thereof which bears against pillar 351 to limit the counterclockwise rotation thereof. A pin'360 on pivoted member 354 extends laterally therefrom and is adapted to engage the upper end of the retaining pawl arm 35! whenthe armature holder is rotated by energization of the magnet to force the retaining pawl against the ratchet wheel,

On shaft M5 is mounted an overthrow ratchet wheel 362 of the same size as ratchet wheel 3i4 but with the teeth pointed in the opposite direction. A pin 363 mounted on holder 308 isadapted to-cooperate with the ratchet wheel 362 when the holder is in the unoperated position shown in Figure 9.

"Suitably mounted type wheels 364 are driven by'whe'el 320. A shaft 365 which is suitably journaled in plates 30! and 366 has a pinion 361 mounted thereon which is driven by gear 368 mounted on stud 3l9. A spiral gear 369 is aflixed to shaft 365, this spiral gear being adapted to mesh with a suitable gear to drive the clock hands'with-which a time stamp is usually provided.

'As in the case of the previously described modification, it is desirable that there be a slight motion of the armature and of the armature holder upon energization'of the winding, even prevents counterclockwise rotation thereof.

though the armature is in the locked position." This slight motion disengages the up-turned end 340 from projection "332 so that there will be no pressure on the latter to prevent the plate 328 from moving to the left upon receipt of a nonlocking impulse. This slight motion of the armature holder in the locked position will cause the pawl3l2 to ride up and down the surface of the ratchet tooth which will tend to rotate the ratchet in the counterclockwise direction. The retaining pawl 352 is adapted to prevent this counterclockwise rotation.

When type wheels are provided in combination with a secondary apparatus, itis essential that the type be exactly centered and that it be rotated a definite amount by each impulse. The position of the retaining pawl pin 352 with re spect to the ratchet tooth is shown in Figure 10, causing exact positioning of the type wheel when the winding is energized or when the apparatus is in the locked position. The vibration accompanying operation of the time stamp when it is locked is likely to cause a clockwise rotation of the ratchet wheel which the tension of spring 353- is not sufficient to prevent. For this reason pivoted member 354 is resiliently mounted on the armature holder so that'it will engage the arm 35! and force the retaining-pawl to the right with sufiicien-t force so that theratchet will seek one definite position with respect to the retaining pawl. It will be seen that the pivoted member 354 is resiliently mounted so that essentially it is the tension of spring 356 which is added to the tensionof spring 353 to cause the positioning of the ratchet wheel. As the winding 303 is de-energized so as to-permit the operating spring 3l6 to cause rotation of the ratchet wheel, pin 360 on pivoted member 354 is disengaged from the arm 35! so that only the force of spring 353 urges the retaining pawl into engagement withthe ratchet wheel,- this force being sufficiently small to permit the ratchet to slip over the re taining pawl to the extent of one tooth. As the armature holder returns to its unoperated position the over-throw pin 363 engages the overthrow ratchet 362 to prevent the energization of the mechanism from carrying the ratchet wheel beyond the position shown in Figure 9 so that the type wheels may be advanced exactly the predetermined distance.

The time stamp shown and described above is adapted to be manually set ahead only by manual reciprocation of the operating lever 308. A modification is shown in Figure 11 by 7 means of which the time stamp may be set either forward or backward manually by means of a key as is the usual practice in time stamps which are commercially in use at the present. To effect manual setting of the printing wheels, clutch means are provided between the ratchet wheel 3| 4 and the gear wheel 320 which clutch means are fully described and shown in co-pending application Serial No. 651,243, now Patent No. 2,214,796, issued September 17, 1940. The clutch means are declutched by the insertion of the key which when rotated drives the type wheels 364 and it also drives the gear train comprising gear 32!, pinion 322 and gear 323, the latter gear being affixed to shaft 324 on which is also mounted the disk 325. The disk as shown in Figures 8 to 10 may be rotatedin the clockwise direction at any time, but the shoulder formed by the cutaway portion 326 As shown in Figure 11 a second disk 310 is provided of slightly larger diameter than disk 3H, which latter disk corresponds to disk 325 in the previous figures, the disk 310 being affixed to shaft 312 to rotate therewith at all times. Disk 310 has three studs 313, 314 and 315 extending from a face thereof, these studs extending through slots 316 correspondingly positioned in disk 31l and the heads of the studs retaining the disk 31I but permitting rotation thereof with respect to disk 310. The disk 31! is loosely mounted on shaft 312 and is adapted to be rotated by engagement of the studs with the disk. A stud 311 is located on a face of disk 3 and a spring 318 is aflixed at either end thereof to studs 311 and 313, the spring serving tomaintain a definite relationship between the two disks, but permitting the disk 318 to be rotated in the counterclockwise direction in opposition to the spring if the disk 31l be blocked against rotation.

Disk 31I is provided with a shoulder 380 formed by cutaway portion 38I, which correspond in function to the shoulder and cutaway portion 326 in disk 325 during normal operation. When the time stamp is manually set back, disk 31!, although it is not afilxedto shaft 312, will rotate with disk 31!], which is affixed to the shaft, until projection 33l engages shoulder 3B0, thereby blocking disk 31l. Further rotation of disk 310 beyond this point will cause cam surface 383 to force the projection 331 off of shoulder 380, the cam surface being formed on the periphery of disk 310. As soon as this takes place the spring 318 will cause the disk 31! to be rotated in the counterclockwise direction to its normal position with respect to disk 310. Although projection 33! will continue to bear against the periphery of disk 310 it will not block further counterclockwise rotation of either disk or of the shaft 312. It will thus be seen that by the use of the second disk, 310, that the type wheels may be rotated either forwardly or backwardly by manual rotation of wheel 320 when the clutch between wheel 32!] and the ratchet wheel 3 is disengaged.

In the corrective system herein described, the master and secondary apparatus each have a cycle of operation of sixty minutes. It is obvious that this cycle of operation may be increased or decreased without departing from the spirit of our invention. The intervals at which the socalled minute impulses and rapid impulses are transmitted may similarly be changed; for instance with an eighty beat per minute master clock, the rapid impulses could be transmitted every one and one-half seconds.

Furthermore, the number of locking positions in each cycle of operation of the secondary, or the number of locking minute impulses, or the number of locking rapid impulses in each cycle of operation of the master clock may be increased or decreased, with corresponding changes in the maximum hourly and maximum cumulative correction or corrective range. The maximum hourly slow correction is equal in number of minutes to the number of rapid impulses, and the maximum hourly fast correction is equal in number of minutes to the number of locking minute impulses. In general, increasing the number of non-locking minute impulses or decreasing the number of locking positions will increase the maximum cumulative slow correction for most positions of the hands. A complementary relationship exists between the maximum cumulative fast and slow ranges; an increase of one causes a decrease of the other.

It is considered more desirable to favor the slow correction at the expense of the fast as impulse driven secondaries do not usually gain time but are likely to lose time due to current interruptions.

Although a plurality of locking positions is not necessary to cause the cumulative slow correction, and the provision thereof will actually shorten the maximum cumulative slow correction over the correction afforded by a single locking position, it does permit a fast correction when the hand of the master clock is set back several minutes through the fifty-ninth position, or when a fast secondary is connected into the corrctive circuit just before the fifty-ninth minute after the hour, the maximum fast correction in these instances being equal in the number of minutes to the number of locking positions.

Various other modifications and changes in the timing, in the circuits and wiring, and in the apparatus above described, as well as changes in the sizes and proportions of the parts thereof, which will occur to those skilled in the art, may be effected without departing from the spirit of our invention, as defined by the following claims, and all statements regarding the operation of our invention are intended to be illustrative only and not limitations on the said claims.

We claim:

1. A corrective clock system comprising a master clock, a secondary clock in circuit therewith, means associated with said master clock for transmitting a series of non-locking impulses at regular intervals, means for transmitting a series of locking impulses at regular intervals, means for transmitting a series of locking impulses at shorter intervals, means associated with the secondary clock for locking it against further advance only during certain consecutive positions of the secondary, said means being responsive only to said locking impulses, and means to advance said secondary clock one step for every impulse received by it from said master clock except when said locking means is operated.

2. A time controlled system comprising a master clock, corrective secondary apparatus and non-corrective apparatus, a corrective secondary circuit including said corrective apparatus and a non-corrective secondary circuit including said non-corrective apparatus, means associated with said master clock for the transmission of minute impulses over both of said circuits, means for the transmission of a series of rapid impulses over said corrective circuit. and means automatically controlled by said master clock for opening said non-corrective circuit during the transmission of said rapid impulses.

3. A time controlled system comprising a master clock, corrective secondary apparatus and non-corrective apparatus, a corrective secondary circuit including said corrective apparatus and a non-corrective secondary circuit including said non-corrective apparatus, a common supply circuit for both of said secondary circuits, means to energize said supply circuit at intervals of one minute, means to energize said supply circuit at more frequent intervals, a relay for controlling the energization of said supply circuit at more frequent intervals, and contacts in said non-corrective circuit operated by said relay for opening said non-corrective circuit when said supply circuit is energized at said frequent intervals.

4. In a clock system, a master clock and means controlled "thereby for the transmission of sixty minute impulses and a number of rapid impulses each hour, said rapid impulses and a minor portion of said minute impulses being locking impulses, a secondary clock adapted to be advanced one minute by eachof said impulses, locking means to render said secondary inoperative during the transmission of said rapid impulses when said secondary is in chronological synchronism with said master clock, and means to render said locking means inoperative for periods exceeding one hour so that when said secondary is'SlOW with respect to said master clock by an amount exceeding the maximum hourly correction and not exceeding a predetermined maximum cumulative correction, the correction will-be cumulative from one hour to the next.

5. A time controlled system comprising a a master clock, secondary apparatus, means to transmit to said secondary normal polarity minute impulses, reversed polarity minute impulses, and reversed polarity rapid impulses, means in said secondary apparatus to advance the same step by step through consecutive minute positions in response to said impulses, means in said secondary apparatus to lock the same against advance by said impulses only when said secondary is inone of a relatively few consecutive predetermined locking minute positions; said locking means being operated only by said reversed polarity .impulses, said transmitting means being controlled by said master clock to effect transmission of said rapid'reversed polarity impulses immediately subsequent to the last minute reversed polarity impulses and during the first of=saidconsecutive locking minute positions of said secondary apparatus when said secondary and said master clock are in on time relationship.

6. In a time controlled system, a master clock having a cycle of operation comprising the transmission of sixty minute impulses of which themajor portion are non-locking and a minor portion are locking impulses, and a plurality of rapid locking impulses succeeding the transmission of said locking minute impulses, and a secondary unit having a cycle of operation during the major portion of which said secondary unit is adapted to be advanced step by step by either locking or non-locking impulses and during the minor portion of which cycle said secondary unit is adapted to be advanced step by step only by non-locking impulses, the timing of said cycles of operation being such that when said master apparatus and said secondary unit are in chronological synchronism said minor portion of said cycle of operation of said secondary unit begins immediately subsequent to the last locking minute impulse transmitted by said master apparatus.

'7. Time controlled system comprising master apparatus and secondary apparatus, means for transmitting a distinctive type of impulse during a corrective period determined by said master apparatus and for a portion of the noncorrective period immediately preceding said corrective period, and means incorporated in said secondaries for locking the same against chronological advancement only during that particular portion of its cycle of operation corresponding to saidcorrective period when said master and said secondary apparatus are in chronological synchronism with each other and during a portion of the non-corrective period immediately succeeding said corrective period, said locking means being operated by the receipt by said secondary of said distinctive type of impulses transmitted thereto by said master apparatus.

8. A time controlled system comprising a master clock and a secondary clock, means controlled by said master clock for the transmission of minute impulses and rapid impulses to said secondary, a majority of the minute impulses being non-locking impulses and a minority of the minute impulses and all of the rapid impulses being locking impulses, the locking impulses all being consecutive and the rapid impulses being transmitted during the minute succeeding the last locking minute impulse, means in said secondary for advancing the same one minute upon the receipt of each impulse, locking means associated with said advancing means and responsive to the receipt of locking impulses only to render said advancingineans inoperative, and means for blocking the action of said locking means in certain positions of said advancing means, there being at least one position of said blocking means wherein said locking means may function to render inoperative said advancing means, said blocking means blocking the action of said locking means for continuous periods exceeding one hour in duration when the slow error between said secondary and said master clock exceeds in number of minutes the number of said rapid impulses and is less than a predetermined maximum cumulative correction of at least thirty minutes.

9. Master apparatus comprising means to transmit an impulse every minute, time controlled means to transmit a series of rapid impulses at a predetermined time during each cycle of operation of said master apparatus, time controlled means to automatically reverse the polarity of said rapid impulses and of a minor portion of said minute impulses immediately preceding the transmission of said rapid impulses, and manually controlled means for transmitting rapid impulses and for simultaneously rendering inoperative said polarity reversing means at any time during said cycle of operation.

10. In combination with a time system having a corrective circuit and a non-corrective circuit, a program instrument comprising a corrective secondary apparatus in parallel with said corrective circuit, contacts actuated by said secondary apparatus and adapted to be closed at predetermined times, a signal circuit, a relay for controlling the operation of said signal cir cuit, said relay being in parallel with said noncorrective circuit and in series with said contacts, a holding circuit for said relay, a source of direct current for said holding circuit, an A. C. circuit controlled by said relay, a heating element in said A. C. circuit, and a thermal circuit breaker associated with said heating element and adapted to break said holding circuit.

11. In combination with impulse transmitting means for the transmission of minute impulses and rapid impulses, a program instrument comprising a signal circuit, means for closing said circuit at predetermined times, said means comprising a relay in series with contact mechanism and in parallel with said impulse transmitting means, and said contact mechanism being operated by a corrective secondary apparatus in parw th S i -1 mpu s m mmia: ans! and ea n'en ne h i it between Saki a n Said: m ul e aiism t ins a s d r n the transmission ofgsaid rapid impulses, I

'12. Asec0ndary apparatns comprising time indicating means, electromagnetic means including an armature for advancingsaid timeine ns me n ing mean ensi e o e eef is a ion of a s o ct oma means for locking said armature to .prevent' the ad m 9 a me ndicatin an y aid l firbme n ii imean a e memb r ssp etse i s ki q ki s means and d t.- ed to yield w hereby, said time indicating means may be advanced manually without unlocking ai arm t e,

3-. scpn ryi p a atu com ri i g. ime indicating means, a ratchet wheel associated therewith, a pawl foradvancing said ratchet (11 n le r ma tfl d d to e n rgizedby impulses, anarmature for cooperation it Sai lest omasn t a atu n s: sociated with said pawl, locking mean s adapted to be m oved intoengagement with said armature to preventcperation of the same, a rotateble member associated with said ratchet wheel and driven thereby at a lower rate of speed than that at which said ratchet wheel rotates, and meansassociated with said rotatable member to reYspi sm qn L d- Q kins. e n duri EiaiI qslt onst i sa s b omemb r econ r ppara us m is e i dieating means, electromagnetic means to ad: var ce said time indicating means, said electro: magnetic means including a reciprocable arma: lw h. may b ra e ma a t dv n e dw i so iq in m an k n means r WY QFm e, dvan e O said timei d catma means by said. electromagnetic means and p sq. td e di placed. by. id l c oma netic, 'means from non-locking position to locking, p0,-

siltion, and vice verse, arotatable member driven byfsai d electromagnetic means for preventing,

displacement of said locking means froninonlocking to locking position during certain .po sitions of said rotatable member, cam means as:

sociated with said rotatable member and said.

locking means whereby saidf rotatable member, by the rotation thereof, may cause displacement Q locking means inoperative in the maiorityhoftthe.

9?: sa dflwkinem ae r mi c klne o an-190k: ins P9 i iqmwhm mtete ihy' manual operation s id-r r q i mq ele mature and: a resilient member s qqiate i; with, sa d; ockin means to e i ma ual per tion; of B-Ida arma u e when said? o k n n iisiin o kinaposition.

n a qQQndam-annaratus for use in; anoneci va me q nt qlledi ystem, a. panel: and a ratshetwhed o ymaine aid: a namtusisten rw te aresflie member afisqciatad: with: said pawl;- fon egec ting; the. advance Qt said-1 ratchet whe n, armature associated; with said pawl; an v electromagnetcooperating with, said annaturek and sponsiveato l impulses of both normal and reversed; pplarity, said-1 armature h and said electromagnet; cooperating; to move. saidv pawl in oppQ itionito. saidresilientzmember. a second resilient member adapted to be moved intoand outotengagementwith said armaturasaid sec- 0nd resilientimember exceeding said first resili'. ent; member in strength, an i auxiliary pole/ piece I91. said electromagnet, a. permanent magnet pivotallyimonnted to. cooperateiwith said auxilryvpole piece. said permanent magnet being associated with said: second resilient member whereby. it will be actuated antimpulsei-ot reversed polarity to cause engagement of said second: resilient member. with said. armature and hereby: rendering said ifi-rst resilient member im effectivefor advancing, saldratchetiwheel, and

m anfiite prevent the engagement of :said second resilient member with: said, armaturei in certain positions of 4 said apparatus.

16., A5 secondary; apparatus for;. a. corrective time system comprising timesindicatmg means,

electromagnetic; means for. advancing; said time. indicating means, means for. locking said time indicating meansiagainst adyanceby said-ad vanging means, and, means wit-rendering said,

hro lo ical positions Ofxsaid-time. indicating means in each:- cycle 101.. its .operation and v for rendering said -lock n smeans.operativein a relatively few=consecut1ve chronological p sitions-1n each; suchv cycle.

1 Herman L; LORENZ.

ERNEST: S; OS'ILER; ADOLPH L; .DENNIS'IOLL:

CERTIFICATE OF CORRECTION.

October 26, 19%.

Patent No. 2,552,828.

' RICHARD L. LORENZ, ET AL.

fled that error appears in the printed specification t requiring correction as follows: Page 5, first read -non-corrective; page 5, sec- V It is hereby Germ.

of the above numbered paten column, line 25, for "non-corrosive" ond column, line 26, for "discs" read --disc; page 6, first column, line 11+, f r "de-energiaztion" read --de-energization-; line 56, for"05 is" read 505 is--; and second column, line 29, for "betwen" read-"between"; line 50, for "postioned' read positioned-; and" that the said L tters Patent should be read with this correction therein that the same may conform to the re ord of the case in the Patent Office. I

Signed and sealed this mm day of March, A. D 19bi Leslie Frazer Acting Commissiorier of Patents.

(Seal) CERTIFICATE OF CORRECTION. Patent No. 2,552,828. oetober 6, WM-

RICHARD L. LORENZ, ET AL.

It is herebj certified that error appears in the printed specification of the above numbered patent requiring correction as follows{ Page 5, first column, line 25, for "non-corrosive" read non-corrective--; page 5, sec 0nd column, line 26, for "discs" read -disc-; page 6, first column, line II for "deenergiaztion" read -de-energization-; line 56, for"505 is" read 505 is--; and second column, line 29, for "betwen" read -between; line 50, for "postioned" read --positioned-; and" that the said Utters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. v w

Signed and sealed this 1mm day of March, A. D. 19th,.

Leslie Frazer (Seal) Acting Conunissiorier of Patents. 

